python/tests/test_zero_crossing_rate.py

   1 #! /usr/bin/env python
   2
   3 from unittest import main
   4 from numpy.testing import TestCase
   5 from aubio import fvec, zero_crossing_rate
   6
   7 buf_size = 2048
   8
   9 class zero_crossing_rate_test_case(TestCase):
  10
  11     def setUp(self):
  12         self.vector = fvec(buf_size)
  13
  14     def test_zeroes(self):
  15         """ check zero crossing rate on a buffer of 0. """
  16         self.assertEqual(0., zero_crossing_rate(self.vector))
  17
  18     def test_ones(self):
  19         """ check zero crossing rate on a buffer of 1. """
  20         self.vector[:] = 1.
  21         self.assertEqual(0., zero_crossing_rate(self.vector))
  22
  23     def test_impulse(self):
  24         """ check zero crossing rate on a buffer with an impulse """
  25         self.vector[int(buf_size / 2)] = 1.
  26         self.assertEqual(0., zero_crossing_rate(self.vector))
  27
  28     def test_negative_impulse(self):
  29         """ check zero crossing rate on a buffer with a negative impulse """
  30         self.vector[int(buf_size / 2)] = -1.
  31         self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
  32
  33     def test_single(self):
  34         """ check zero crossing rate on single crossing """
  35         self.vector[int(buf_size / 2) - 1] = 1.
  36         self.vector[int(buf_size / 2)] = -1.
  37         self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
  38
  39     def test_single_with_gap(self):
  40         """ check zero crossing rate on single crossing with a gap"""
  41         self.vector[int(buf_size / 2) - 2] = 1.
  42         self.vector[int(buf_size / 2)] = -1.
  43         self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
  44
  45 if __name__ == '__main__':
  46     main()